发明名称 |
CARBON DIOXIDE BLOWN LOW DENSITY, FLEXIBLE MICROCELLULAR POLYURETHANE ELASTOMERS |
摘要 |
<p>Microcellular polyurethane flexible foams having densities no greater than 0.3 g/cc which are suitable for use as lightweight shoe sole components are produced with carbon dioxide in an amount such that the polyurethane-forming mixture has a free rise density of from about 0.03 to about 0.3 g/cc. At least a portion of that carbon dioxide is dissolved as a gas into one or both of the reaction components. The amount of dissolved carbon dioxide must be such that the froth density of the isocyanate and/or isocyanate-reactive component(s) in which the carbon dioxide is dissolved will be from about 0.1 to about 0.8 g/cc. Additional carbon dioxide may be formed by the reaction of water and isocyanate during the polyurethane-formi ng reaction but the total amount of CO2 present should be controlled to ensure that the polyurethane-forming mixture has a free rise density of from about 0.03 to 0.3g/cc. Use of a preferred isocyanate-reactive component in which a specified ratio of diol to triol is satisfied makes it possible to use more water than had been expected. Use of a preferred prepolymer makes it possible to produce microcellular polyurethanes having good physical properties solely with a diol. The product microcellular foams possess a uniform cell structure and enhanced physical properties as compared toall water-blown foams of the same basic formulation and density. The hardness of the foams is more suitable for shoe sole, particularly midsole applications, than that of the water-blo wn foams, despite the lower urea hard segment content of the CO2 blown foams.</p> |
申请公布号 |
CA2547103(A1) |
申请公布日期 |
2006.11.27 |
申请号 |
CA20062547103 |
申请日期 |
2006.05.16 |
申请人 |
BAYER MATERIALSCIENCE LLP |
发明人 |
YOUNES, USAMA E.;CARPENTER, CHARLES R.;BAILY, DAVID M. |
分类号 |
C08G18/70;B29D35/12;C08G18/12;C08G18/48;C08G18/79;C08J9/08;C08K3/20 |
主分类号 |
C08G18/70 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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